TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker and becoming a Supporting Member. For more info: Support TMC

I'm on my second UMC. The first one started to give an "External Charger Problem" fault once every couple of weeks when waking up to charge, but never for immediate charging. This became more frequent, and I uploaded my logs and talked to the local Service Center.

A few weeks later, my UMC was failing to charge for more than 20 minutes. I uploaded logs again, and got a call a few minutes later to bring it to the Service Center. They loaned me their UMC while they tried charging Roadsters with mine. Two weeks later, I got another call telling me that a new UMC was waiting for me at the Service Center. It was replaced free of charge.

I *will be* on my 4th spare connector cable (110V, 12amp). I just haven't had time to go in to the service center for them to fix it. Its always the "plug head" and they just replace the head for me. Haven't charged me yet but I never know if when they'll start.

3.5 years & 72,000 kms, and nary a problem with either my Roadster HPC nor UMC...53,000 kms and 1.5 years on my wife's Model S, and she's on her second HWPC & UMC......must be the way she drives. :wink:

I went through 3, but had Tesla replace them each time since I still have my warranty. But I ended up installing this and just using my J1772 adapter. Have not had any issues in the past couple of months.

I too, am on my third, the first two had problems from the beginning. I was told by Tesla that heat was the problem that most often causes UMC failure, and I installed a small fan above where it lives in my garage (no HPC) to keep the UMC body cool. So far, so good, after a bit over a year. Mind you, the first one (that came with my CPO Roadster) was labelled as "shop use only" (?), the second was a remanufactured one, the one I have now was brand new.

Meta

Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.